Method And Device For Setting Working Frequency Band Of Touch Detection System

Abstract

The present disclosure discloses a method and a system for setting working frequency band of a touch detection system. A method for setting working frequency band of a touch detection system includes the following steps of: collecting noise frequency spectrogram in a touch detection system of a touch apparatus in a normal operation mode; and, determining a frequency band which is within whole frequency band supported by the touch detection system and in which amplitude of the noise is less than a first threshold, according to the noise frequency spectrogram collected; and setting the frequency band in which amplitude of the noise is less than the first threshold to be effective working frequency band of the touch detection system. Meanwhile, the present disclosure also discloses a method and a system for suppressing noise in a touch detection system.

1 . A method for setting working frequency band of a touch detection system, the method comprising the following steps of:
 S 110 : collecting a noise frequency spectrogram of a touch detection system of a touch apparatus in a normal operation mode; and   S 120 : determining a frequency band which is within whole frequency band supported by the touch detection system and in which amplitude of the noise is less than a first threshold, according to the noise frequency spectrogram collected; and setting the frequency band in which amplitude of the noise is less than the first threshold to be effective working frequency band of the touch detection system.   
     
     
         2 . The method for setting working frequency band of a touch detection system according to  claim 1 , wherein,
 the noise frequency spectrogram of the touch detection system of the touch apparatus in the normal operation mode is collected by a frequency spectrum scanning module embedded in the touch apparatus.   
     
     
         3 . The method for setting working frequency band of the touch detection system according to  claim 1 , wherein,
 the normal operation mode comprises at least one of the operation modes including:   operation of the touch apparatus when the touch apparatus is being charged, operation of the touch apparatus when the touch apparatus is held in hand, operation of the touch apparatus when the touch apparatus is placed on table, and operation of the touch apparatus when the touch apparatus is displaying a picture.   
     
     
         4 . The method for setting working frequency band of the touch detection system according to  claim 3 , wherein,
 the first threshold is determined based on whether or not the touch detection system of the touch apparatus is capable of detecting properly a touch action in the normal operation mode.   
     
     
         5 . The method for setting working frequency band of the touch detection system according to  claim 1 , further comprising a step of:
 storing the effective working frequency band into a memory of the touch apparatus.   
     
     
         6 . A method for suppressing noise in a touch detection system, the method comprising the following steps of:
 S 210 : collecting noise frequency spectrogram of a touch detection system of a touch apparatus in a normal operation mode;   S 220 : determining a frequency band which is within whole frequency band supported by the touch detection system and in which amplitude of the noise is less than a first threshold, according to the noise frequency spectrogram collected; and setting the frequency band in which amplitude of the noise is less than the first threshold to be effective working frequency band of the touch detection system;   S 230 : setting certain driving frequency in the effective working frequency band to be an initial working frequency of the touch detection system;   S 240 : driving the touch detection system at the initial working frequency, and detecting amplitude of the noise in the touch detection system when the touch detection system is driven at the initial working frequency;   S 250 : judging whether or not amplitude of the noise in the touch detection system when the touch detection system is driven at the initial working frequency is greater than the first threshold, and, if no, going back to the step  5240 , or if yes, continuing to execute the following step S 260 ;   S 260 : driving the touch detection system at driving frequencies in the effective working frequency band in sequence, and detecting amplitude of the noise of the touch detection system when the touch detection system is driven at each of the driving frequencies; and   S 270 : hopping to a driving frequency that corresponds to minimum amplitude of the noise, and driving the touch detection system at the driving frequency that corresponds to the minimum amplitude of the noise.   
     
     
         7 . The method for suppressing the noise in the touch detection system according to  claim 6 , wherein, the step S 230  comprises:
 determining a frequency which is within whole frequency band supported by the touch detection system and at which amplitude of the noise is minimum, according to the noise frequency spectrogram collected; and setting the frequency at which amplitude of the noise is minimum to be the initial working frequency of the touch detection system. 
 
     
     
         8 . The method for suppressing the noise in the touch detection system according to  claim 6 , wherein:
 the noise frequency spectrogram of the touch detection system of the touch apparatus in the normal operation mode is collected by a frequency spectrum scanning module embedded in the touch apparatus.   
     
     
         9 . The method for suppressing the noise in the touch detection system according to  claim 6 , wherein:
 the normal operation mode comprises at least one of the operation modes including: operation of the touch apparatus when the touch apparatus is being charged, operation of the touch apparatus when the touch apparatus is held in hand, operation of the touch apparatus when the touch apparatus is placed on table, and operation of the touch apparatus when the touch apparatus is displaying a picture.   
     
     
         10 . The method for suppressing the noise in the touch detection system according to  claim 9 , wherein:
 the first threshold is determined based on whether or not the touch detection system of the touch apparatus is capable of detecting properly a touch action in the normal operation mode.   
     
     
         11 . The method for suppressing the noise in the touch detection system according to  claim 6 , further comprising a step of:
 storing the effective working frequency band and the initial working frequency into a memory of the touch apparatus.   
     
     
         12 . A device for setting working frequency band of a touch detection system according to  claim 1 , the device comprising:
 a noise frequency spectrum collecting unit configured to collect a noise frequency spectrogram of a touch detection system of a touch apparatus in a normal operation mode; and   a working frequency band setting unit configured to determine a frequency band which is within whole frequency band supported by the touch detection system and in which amplitude of the noise is less than a first threshold, according to the noise frequency spectrogram collected;   and to set the frequency band in which amplitude of the noise is less than the first threshold to be effective working frequency band of the touch detection system.   
     
     
         13 . The device for setting working frequency band of the touch detection system according to  claim 12 , wherein, the noise frequency spectrum collecting unit comprises a frequency spectrum scanning module embedded in the touch apparatus. 
     
     
         14 . The device for setting working frequency band of the touch detection system according to  claim 12 , further comprises:
 a storage unit configured to store the effective working frequency band.   
     
     
         15 . A device for implementing the method of suppressing noise in the touch detection system according to  claim 6 , comprising:
 a noise frequency spectrum collecting unit configured to collect noise frequency spectrogram in a touch detection system of a touch apparatus in a normal operation mode;   a working frequency band setting unit configured to determine a frequency band which is within whole frequency band supported by the touch detection system and in which amplitude of the noise is less than a first threshold, according to the noise frequency spectrogram collected;   and to set the frequency band in which amplitude of the noise is less than the first threshold to be effective working frequency band of the touch detection system;   an initial working frequency setting unit configured to set certain frequency in the effective working frequency band to be an initial working frequency of the touch detection system;   a driving unit configured to drive the touch detection system at any of driving frequencies in the effective working frequency band;   a driving control unit configured to control the driving unit to drive the touch detection system at the initial working frequency, and to control the driving unit to drive the touch detection system at the driving frequencies of the effective working frequency band in sequence;   a noise detecting unit configured to detect amplitude of the noise in the touch detection system when the touch detection system is driven by the driving unit at each of the driving frequencies;   a judging unit configured to judge whether or not the amplitude of the noise in the touch detection system which is detected when the touch detection system is driven at the initial working frequency is greater than the first threshold; if yes, to control the driving unit to drive the touch detection system at the driving frequencies of the initial working frequency band in sequence; and if no, to control the driving unit to continue to drive the touch detection system at the initial working frequency; and   a hopping control unit configured to determine a driving frequency that corresponds to minimum amplitude of the noise in accordance with a result of detection of the noise detecting unit, and to control the driving unit to drive the touch detection system at the driving frequency that corresponds to the minimum amplitude of the noise.   
     
     
         16 . The device for suppressing noise in the touch detection system according to  claim 15 , wherein:
 the noise frequency spectrum collecting module comprises a frequency spectrum scanning module embedded in the touch apparatus.   
     
     
         17 . The device for suppressing noise in the touch detection system according to  claim 15 , further comprises:
 a storage unit configured to store the effective working frequency band and the initial working frequency.